SEARCH

Search Details

FUKE Nobuhiro
Graduate School of Science, Technology and Innovation / Department of Science, Technology and Innovation
Associate Professor

Researcher basic information

■ Research Keyword
  • energy finance
  • strategic entrepreneurship
  • Entrepreneurial finance
■ Research Areas
  • Humanities & social sciences / Money and finance
  • Humanities & social sciences / Business administration

Research activity information

■ Paper
  • Nikolay S. Makarov, Hunter McDaniel, Nobuhiro Fuke, Istvan Robel, Victor I. Klimov
    Transient absorption and time-resolved photoluminescence measurements of high-performance mesoporous TiO2 photoanodes sensitized with CuInSexS2-x quantum dots reveal the importance of hole scavenging in the characterization of photoinduced electron transfer. The apparent characteristic time of this process strongly depends on the local environment of the quantum dot/TiO2 junction due to accumulation of long-lived positive charges in the quantum dots. The presence of long-lived photoexcited holes introduces artifacts due to fast positive-trion Auger decay (60 ps time constant), which can dominate electron dynamics and thus mask true electron transfer. We show that the presence of a redox electrolyte is critical to the accurate characterization of charge transfer, since it enables fast extraction of holes and helps maintain charge neutrality of the quantum dots. Although electron transfer is observed to be relatively slow (19 ns time constant), a high electron extraction efficiency (>95%) can be achieved because in well-passivated CuInSexS2-x quantum dots neutral excitons have significantly longer lifetimes of hundreds of nanoseconds.
    AMER CHEMICAL SOC, Jan. 2014, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 5(1) (1), 111 - 118, English
    Scientific journal

  • Hunter McDaniel, Nobuhiro Fuke, Nikolay S. Makarov, Jeffrey M. Pietryga, Victor I. Klimov
    Solution-processed semiconductor quantum dot solar cells offer a path towards both reduced fabrication cost and higher efficiency enabled by novel processes such as hot-electron extraction and carrier multiplication. Here we use a new class of low-cost, low-toxicity CuInSexS2-x quantum dots to demonstrate sensitized solar cells with certified efficiencies exceeding 5%. Among other material and device design improvements studied, use of a methanol-based polysulfide electrolyte results in a particularly dramatic enhancement in photocurrent and reduced series resistance. Despite the high vapour pressure of methanol, the solar cells are stable for months under ambient conditions, which is much longer than any previously reported quantum dot sensitized solar cell. This study demonstrates the large potential of CuInSexS2-x quantum dots as active materials for the realization of low-cost, robust and efficient photovoltaics as well as a platform for investigating various advanced concepts derived from the unique physics of the nanoscale size regime.
    NATURE PUBLISHING GROUP, Dec. 2013, NATURE COMMUNICATIONS, 4, English
    Scientific journal

  • Hunter McDaniel, Nobuhiro Fuke, Jeffrey M. Pietryga, Victor I. Klimov
    AMER CHEMICAL SOC, Apr. 2013, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 4(7) (7), 1059 - 1059, English

  • Engineered CuInSexS2-x quantum dots for high efficiency sensitized solar cells
    Hunter McDaniel, Nobuhiro Fuke, Jeffrey M. Pietryga, Victor I. Klimov
    AMER CHEMICAL SOC, Apr. 2013, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 245, English

  • Hunter McDaniel, Nobuhiro Fuke, Jeffrey M. Pietryga, Victor I. Klimov
    Colloidal CuInSexS2-x quantum dots (QDs) are an attractive less-toxic alternative to PbX and CdX (X = S, Se, and Te) QDs for solution-processed semiconductor devices. This relatively new class of QD materials is particularly suited to serving as an absorber in photovoltaics, owing to its high absorption coefficient and near-optimal and finely tunable band gap. Here, we engineer CuInSexS2-x QD sensitizers for enhanced performance of QD-sensitized TiO2 solar cells (QDSSCs). Our QD synthesis employs 1-dodecanethiol (DDT) as a low-cost solvent, which also serves as a ligand, and a sulfur precursor; addition of triakylphosphine selenide leads to incorporation of controlled amounts of selenium, reducing the band gap compared to that of pure CuInS2 QDs. This enables significantly higher photocurrent in the near-infrared (IR) region of the solar spectrum without sacrificing photovoltage. In order to passivate QD surface recombination centers, we perform a surface-cation exchange with Cd prior to sensitization, which enhances chemical stability and leads to a further increase in photocurrent. We use the synthesized QDs to demonstrate proof-of-concept QDSSCs with up to 3.5% power conversion efficiency.
    AMER CHEMICAL SOC, Feb. 2013, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 4(3) (3), 355 - 361, English
    Scientific journal

  • Ryuzi Katoh, Aidhiro Furube, Nobuhiro Fuke, Atsushi Fukui, Naold Koide
    The photoinduced electron injection process in black dye (BD, trithiocyanato (4,4',4 ''-tricarboxy-2,2':6',2 ''-terpyridine)ruthenium(II); Ru(tcterpy) (NCS)(3)) adsorbed on nanocrystalline TiO2 films was studied by means of transient absorption and luminescence spectroscopy with subnanosecond time resolution in air and in 0.5 M solution of 4-tert-butylpyridine in acetonitrile. The resulting intensities and temporal profiles differed substantially between these conditions, whereas the electron injection efficiencies were almost the same. Generation efficiency of triplet excited state can be also evaluated, and thus the branching ratio of photoexcited BD/TiO2 can be obtained. These results clearly indicate that ultrafast relaxation from the primary excited state to the ground state occurs efficiently, probably owing to ultrafast recombination at the BD/TiO2 interface, and non-electron-injecting dyes exist on the surface. Accordingly, we conclude that the electron injection efficiency in BD/TiO2 is not simply limited by competition between the rate of deactivation in excited state and the rate of electron injection.
    AMER CHEMICAL SOC, Oct. 2012, JOURNAL OF PHYSICAL CHEMISTRY C, 116(42) (42), 22301 - 22306, English
    Scientific journal

  • n-Butylamine capped CdSe quantum dot sensitized solar cells
    Nobuhiro Fuke, Paul Szymanski, Alexey Y. Koposov, Virginia W. Manner, Laura B. Hoch, Milan Sykora
    AMER CHEMICAL SOC, Aug. 2011, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 242, English

  • Paul Szymanski, Nobuhiro Fuke, Alexey Y. Koposov, Virginia W. Manner, Laura B. Hoch, Milan Sykora
    We report a study of the internal quantum efficiency (IQE) of CdSe quantum-dot (QD)-sensitized solar cells prepared by direct adsorption of pre-synthesized QDs, passivated with either tri-n-octylphosphine oxide (TOPO) or n-butylamine (BA), onto a nanocrystalline TiO2 film.
    Corresponding, ROYAL SOC CHEMISTRY, 2011, CHEMICAL COMMUNICATIONS, 47(22) (22), 6437 - 6439, English
    Scientific journal

  • Nobuhiro Fuke, Laura B. Hoch, Alexey Y. Koposov, Virginia W. Manner, Donald J. Werder, Atsushi Fukui, Naoki Koide, Hiroyuki Katayama, Milan Sykora
    We have constructed and studied photoelectrochemical solar cells (PECs) consisting of a photoanode prepared by direct deposition of independently synthesized CdSe nanocrystal quantum dots (NQDs) onto a nanocrystalline TiO2 film (NQD/TiO2), aqueous Na2S or Li2S electrolyte, and a Pt counter electrode We show that light harvesting efficiency (LHE) of the NQD/TiO2 photoanode is significantly enhanced when the surface passivation is changed from tri n octylphosphine oxide(TOPO) to 4-butylamine (BA) In the PEC the use of NQDs with a shorter passivating ligand, BA, leads to a significant enhancement in both the electron injection efficiency it the NQD/TiO2 interface and charge collection efficiency at the NQD/electrolyte interface, with the latter attributed mostly to a more efficient diffusion of the electrolyte through the pores of the photoanode We show that by utilizing BA-capped NQDs and aqueous Li2S as an electrolyte, It is possible to achieve similar to 100% internal, quantum efficiency of photon to-electron conversion, matching the performance of dye sensitized solar cells
    AMER CHEMICAL SOC, Nov. 2010, ACS NANO, 4(11) (11), 6377 - 6386, English
    Scientific journal

  • Ryuzi Katoh, Nobuhiro Fuke, Akihiro Furube, Naoki Koide
    The effect of dye coverage on the photo-induced electron injection efficiency in N719-sensitized nanocrystalline TiO2 films was studied by transient absorption spectroscopy. We evaluated the electron injection efficiency of films with several dye concentrations on the surface and found no significant difference between them. We also studied the suppression of the efficiency by the addition of tBP (4-tert-butylpyridine) and found that the effect of tBP was more pronounced for films with lower dye loading. This suggests that sensitizer dyes adsorbed densely onto the surface suppress the adsorption of tBP. (C) 2010 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, Apr. 2010, CHEMICAL PHYSICS LETTERS, 489(4-6) (4-6), 202 - 206, English
    Scientific journal

  • Ryuzi Katoh, Motohiro Kasuya, Satoshi Kodate, Akihiro Furube, Nobuhiro Fuke, Naoki Koide
    Using transient absorption spectroscopy, we investigated the effects of 4-tert-butylpyridine (tBP) and Li ions on photoinduced electron injection efficiency in nancrystalline TiO2 films sensitized by black dye. The efficiency increased with the addition of Li ions but decreased with the addition of tBP molecules. These results indicate that a conduction band shift was induced by the solvation effect of the additives. Using recombination kinetic measurements, we examined that such a solvation effect was induced by the intercalation of Li ions into TiO2 particles and by the adsorption of tBP on the TiO2 surface. When both additives were used simultaneously, the efficiency was Suppressed more than when only tBP was added. This difference in efficiency suggests that the local concentration of tBP near the TiO2 surface increased with the addition of Li ions. This cooperative effect may have been caused by the formation of a complex between tBP and Li in Solution.
    AMER CHEMICAL SOC, Dec. 2009, JOURNAL OF PHYSICAL CHEMISTRY C, 113(48) (48), 20738 - 20744, English
    Scientific journal

  • Atsushi Fukui, Nobuhiro Fuke, Ryoichi Komiya, Naoki Koide, Ryohsuke Yamanaka, Hiroyuki Katayama, Liyuan Han
    In this paper we investigate a dye-sensitized photovoltaic module (DSM) composed of many rectangular cells connected in series, known as a W-connected type module, where neighboring cells are processed in reverse. The characteristics of the serial connection of silicon solar cells have been investigated extensively, while, with dye-sensitized photovoltaic modules, the influence of each rectangular cell performance on the serially connected module has not been investigated as thoroughly. Here we investigate the performance of the rectangular cell in dye-sensitized photovoltaic modules, and we clarify the correlation between the conversion efficiency of the module and the uniformity of the TiO2 layer thicknesses. With these improvements, we achieved an overall energy conversion efficiency of 8.4% (aperture area: 26.47 cm(2)) as measured by a public test center under AM-1.5 irradiation. This sets a record for the confirmed efficiency of the DSM. (C) 2009 The Japan Society of Applied Physics
    JAPAN SOC APPLIED PHYSICS, Aug. 2009, APPLIED PHYSICS EXPRESS, 2(8) (8), English
    Scientific journal

  • Nobuhiro Fuke, Atsushi Fukui, Ashraful Islam, Ryoichi Komiya, Ryohsuke Yamanaka, Hiroshi Harima, Liyuan Han
    The influence of the TiO2/electrode interface was investigated on electron transport properties at the interface and in TiO2 porous film in back contact dye-sensitized solar cells. Analysis of dye-sensitized solar cells (DSCs) with Ti and TCO indicated that electron transport properties at TiO2/Ti and TiO2/TCO interfaces are similar despite the former's lack of a 'built-in potential'. The dependence of short circuit current density on TiO2 thickness indicated that TiO2 electron transport is not affected by 'built-in potential' or electrode structure. Electron transport thus appears similar in back contact dye-sensitized solar cells and DSCs. A back contact dye-sensitized solar cell fabricated with a Ti electrode and optimum TiO2 porous film showed a conversion efficiency of 7.8% with a metal mask under an air mass of 1.5 sunlight. (C) 2008 Elsevier B.V. All rights reserved.
    Lead, ELSEVIER SCIENCE BV, Jun. 2009, SOLAR ENERGY MATERIALS AND SOLAR CELLS, 93(6-7) (6-7), 720 - 724, English
    Scientific journal

  • Ryuzi Katoh, Motohiro Kasuya, Akihiro Furube, Nobuhiro Fuke, Naoki Koide, Liyuan Han
    The effects of various solvents on the electron injection efficiency for nanocrystalline TiO2 films sensitized with the black dye trithiocyanato(4,4',4 ''-tricarboxy-2,2':6',2 ''-terpyridine)ruthenium(II) (Ru(tcterpy)(NCS)(3)) have been studied quantitatively. The electron injection efficiency for the film dried in air was estimated as 0.4 using a time-resolved microwave conductivity technique. Using transient absorption measurements, we estimated the efficiency of electron injection for TiO2 films in various solvents. Acetonitrile, which is widely considered to be the best solvent for solar cell performance, had the highest efficiency (similar to 0.65), and other solvents (3-methoxypropionitrile, gamma-butyrolactone, and propylene carbonate) had lower efficiencies. These results suggest that characteristic interactions between the black dye and the -CN groups of solvents are important for achieving higher electron injection efficiency. (C) 2008 Elsevier B.V. All rights reserved.
    ELSEVIER, Jun. 2009, SOLAR ENERGY MATERIALS AND SOLAR CELLS, 93(6-7) (6-7), 698 - 703, English
    Scientific journal

  • Ryuzi Katoh, Motohiro Kasuya, Akihiro Furube, Nobuhiro Fuke, Naoki Koide, Liyuan Han
    We evaluated the charge recombination rate in N719-sensitized nanocrystalline TiO2 films after photoinduced charge separation under substantially weak excitation conditions. We found that the recombination rates did not reach a constant value but instead decreased with decreasing light intensity. (C) 2009 Elsevier B. V. All rights reserved.
    ELSEVIER SCIENCE BV, Mar. 2009, CHEMICAL PHYSICS LETTERS, 471(4-6) (4-6), 280 - 282, English
    Scientific journal

  • Nobuhiro Fuke, Ryuzi Katoh, Ashraful Islam, Motohiro Kasuya, Akihiro Furube, Atsushi Fukui, Yasuo Chiba, Ryohichi Komiya, Ryohsuke Yamanaka, Liyuan Han, Hiroshi Harima
    To better understand why titanium tetrachloride (TiCl4) treatment improves short circuit current, we studied its effects on back contact dye-sensitized solar cells sensitized with black dye [tri(thiocyanato)(4,4',4 ''-tricarboxy-2,2':6',2 ''-terpyridine) ruthenium(II), Ru(tcterpy)(NCS)(3)] using transient absorption spectroscopy and electrochemical impedance spectroscopy. We found that the TiCl4 treatment improved short circuit current and achieved an overall energy conversion efficiency of 8.9%. The transient absorption signals did not change as a result of the treatment, suggesting that electron injection efficiency is not affected by the treatment. The impedance related to electron transport between TiO2 particles decreased and the peak frequency of the imaginary part of the electrochemical impedance spectra assigned to electron transfer from TiO2 to the redox couple was shifted to lower frequency by the treatment. This clearly indicates that TiCl4 treatment improved electron transport in the nanocrystalline TiO2 film in back contact dye-sensitized solar cells.
    Lead, ROYAL SOC CHEMISTRY, 2009, ENERGY & ENVIRONMENTAL SCIENCE, 2(11) (11), 1205 - 1209, English
    Scientific journal

  • Liyuan Han, Atsushi Fukui, Yasuo Chiba, Ashraful Islam, Ryoichi Komiya, Nobuhiro Fuke, Naoki Koide, Ryohsuke Yamanaka, Masafumi Shimizu
    We investigated an integrated dye-sensitized solar cell (DSC) module composed of a number of rectangular cells connected in series. Because neighboring cells are processed in reverse, the module is known as the W-contact module. It achieves a high active area of 85% by eliminating the interconnection between neighboring cells. By adjusting the transmittance of the Pt-coated counterelectrode, the TiO2 thickness, and the composition of the electrolyte, we achieved an overall energy conversion efficiency of 8.2% (aperture area of 25.45 cm(2)) as measured by a public test center under AM 1.5 irradiation. This sets a record for the confirmed efficiency of a DSC submodule.
    AMER INST PHYSICS, Jan. 2009, APPLIED PHYSICS LETTERS, 94(1) (1), English
    Scientific journal

  • Nobuhiro Fuke, Atsushi Fukui, Ashraful Islam, Ryoichi Komiya, Ryohsuke Yamanaka, Liyuan Han, Hiroshi Harima
    The electron transport properties of a back contact dye-sensitized solar cell (BCDSC) were investigated in comparison with a conventional DSC. It was found that the BCDSC had a lower short circuit current density (J(SC)) at the same thickness of TiO(2) film and that Jsc was not proportional to the thickness of the TiO(2) film. Calculation of electron transport length in the TiO(2) film suggested that the injected electron travels a longer distance to the electrode in the BCDSC than in the DSC. TiCl(4) treatment of the TiO(2) film produced a marked improvement of the Jsc value in the BCDSC due to an increase in the electron diffusion coefficient of the TiO(2) film, whereas the J(SC) of the DSC remained almost unchanged. It is clear that the value of Jsc in the BCDSC is more dependent on the electron transport properties of the TiO(2) film than in the DSC. Under standard AM 1.5 irradiation (100 mW cm(-2)), a BCDSC with N719 dye yielded an overall conversion efficiency of 8.0%. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2975182]
    Lead, AMER INST PHYSICS, Sep. 2008, JOURNAL OF APPLIED PHYSICS, 104(6) (6), English
    Scientific journal

  • Nobuhiro Fuke, Atsushi Fukui, Ryohichi Komiya, Ashraful Islam, Yasuo Chiba, Masatoshi Yanagida, Ryohsuke Yamanaka, Liyuan Han
    Much attention has been paid to the development of dye-sensitized solar cells (DSCs) owing to a possibility of low production cost. One of the main factors that has hampered the practical application of DSCs is the use of a transparent conducting oxide (TCO) substrate of very high cost. Here we introduce a newly structured DSC back contact dye-sensitized solar cell (BCDSC) in which the TCO is omitted and a porous Ti electrode for electron collection, called a back contact electrode (BCE), is placed on the side opposite to the side of light irradiation. We succeeded in fabricating on the TiO2 film a BCE with large enough pore size for both efficient dye adsorption onto the film and smooth I(-)/I(3)(-) redox couple transportation through the film. Electrochemical impedance spectroscopy study showed that increase in the BCE thickness causes increase in the I(-)/I(3)(-) redox couple transport resistance at the same time as reduction of BCE resistance. Under standard air mass (AM) 1.5 irradiation (100 mW cm(-2)), a BCDSC with N719 dye yielded an overall conversion efficiency of 8.4%. An intensity modulated photovoltage spectroscopy (IMVS) study indicated that the lifetime of electrons in the TiO(2) film of the BCDSC is long enough for them to reach the BCE. The BCDSC therefore has the potential for high photovoltaic performance even though the TiO(2) film contains many interfaces between TiO(2) Particles such as the grain boundary in the polycrystalline silicon. The high-efficiency BCDSC achieved in the present study brings a low-cost DSC one step closer to practical use.
    Lead, AMER CHEMICAL SOC, Aug. 2008, CHEMISTRY OF MATERIALS, 20(15) (15), 4974 - 4979, English
    Scientific journal

  • Nobuhiro Fuke, Atsushi Fukui, Yasuo Chiba, Ryoichi Komiya, Ryosuke Yamanaka, Liyuan Han
    A new structure for dye-sensitized solar cells (DSCs) was proposed in which the transparent conducting oxide (TCO) is omitted and the cathode is located on the opposite side of the titanium dioxide (TiO2) film surface to the side of light irradiation. DSCs with this structure are called back contact DSCs (BCDSCs). The structure and fabrication of the cathode of BCDSCs was investigated in comparison with silicon solar cells. BCDSCs with conversion efficiency of 7.1% were achieved by vacuum deposition of the cathode directly onto the TiO2 film, suggesting that BCDSCs can function as effective solar cells with potentially increased efficiency due to the omission of the TCO.
    Lead, INST PURE APPLIED PHYSICS, May 2007, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 46(17-19) (17-19), L420 - L422, English
    Scientific journal

  • Ryuzi Katoh, Akihiro Furube, Motohiro Kasuya, Nobuhiro Fuke, Naoki Koide, Liyuan Han
    Photoinduced electron injection in nanocrystalline TiO2 films sensitized with black dye [trithiocyanato(4,4',4 ''- tricarboxy-2,2': 6',2 ''-terpyridine) ruthenium(II), Ru(tcterpy)(NCS)(3)] was studied by means of transient absorption ( TA) spectroscopy. We examined the effect of the additive 4-tert-butylpyridine (TBP) in acetonitrile, which is known to markedly improve the performance of solar cell devices. The efficiency of electron injection for the film immersed in acetonitrile was 50% higher than that for the film dried in air. Femtosecond TA measurements indicated that this efficiency enhancement was due to the opening of an additional injection pathway from a lower-lying energy level. Upon the addition of 1 M TBP, which is known to raise the level of the conduction band of TiO2, the enhancement induced by acetonitrile disappeared. We discuss the mechanism of electron injection by comparing our results with results previously reported for the N-3/TiO2 system.
    ROYAL SOC CHEMISTRY, 2007, JOURNAL OF MATERIALS CHEMISTRY, 17(30) (30), 3190 - 3196, English
    Scientific journal

  • Ashraful Islam, Firoz A. Chowdhury, Yasuo Chiba, Ryoichi Komiya, Nobuhiro Fuke, Noriaki Ikeda, Koichi Nozaki, Liyuan Han
    A new series of aryl-substituted beta-diketonato-ruthenium(II)-polypyridyl sensitizers, [Ru(Htctpy)(tfpbd)-(NCS) {(C4H9)(4)N}(2)] (1), [Ru(Htctpy)(tffpbd)(NCS){(C4H9)(4)N}(2)] (2), and [Ru(Htctpy)(tfcpbd)(NCS){(C4H9)(4)N}(2)] (3), were synthesized and fully characterized by elemental analysis, UV-visible and emission spectroscopy, NMR, ATR-FTIR, cyclic voltammetric studies, and density functional theory (DFT) calculations (where tctpy = 4,4 ' 4 ''-tricarboxy-2,2 ':6 ',2 ''-terpyridine, tfpbd) 4,4,4-trifluoro-1-(phenyl)-butane- 1,3-dione, tffpbd) 4,4,4-trifluoro-1- (4-fluorophenyl)butane-1,3-dione, and tfcpbd = 4,4,4-trifluoro-1-(4-chlorophenyl)butane-1,3-dione). In ethanol-methanol solution, these complexes exhibit intense visible light absorption, with low-energy MLCT band maxima above 600 nm. A distinct shoulder at around 680 nm improved red-light absorptivity beyond 680 nm. Controlled shifting of the low-energy MLCT band and Ru oxidation potential can be achieved by changing the electron donor ability of the beta-diketonate ligand using various aryl substituents of the beta-diketonate ligand with differing electron- donating strengths. Density functional theory (DFT) calculation of complex 2 shows that the HOMO is localized on the NCS ligand and the LUMO on the tctpy ligand, which is anchored to the TiO2 nanoparticles. The aryl-substituted beta-diketonato-ruthenium(II)-polypyridyl sensitizers, when anchored to nanocrystalline TiO2 films, achieve very efficient sensitization, with greater than 80% incident photon-to-current conversion efficiency (IPCE) in the whole visible range extending up to 950 nm. Under standard AM 1.5 irradiation (100 mW cm(-2)) and using an electrolyte consisting of 0.6 M dimethylpropyl-imidazolium iodide, 0.05 M I-2, 0.1 M LiI, and 0.07 M tert-butylpyridine in acetonitrile, a solar cell containing complex 2 yielded a short-circuit photocurrent density of 19.1 mA cm(-2), an open-circuit photovoltage of 0.66 V, and a fill factor of 0.72, corresponding to an overall conversion efficiency of 9.1%.
    AMER CHEMICAL SOC, Oct. 2006, CHEMISTRY OF MATERIALS, 18(22) (22), 5178 - 5185, English
    Scientific journal

  • Liyuan Han, Naoki Koide, Yasuo Chiba, Ashraful Islam, Ryoichi Komiya, Nobuhiro Fuke, Atsushi Fukui, Ryohsuke Yamanaka
    With the aim of increasing conversion efficiency, the series-internal resistance of dye-sensitized solar cells (DSCs) was investigated with electrochemical impedance spectroscopy measurement based on an equivalent circuit of DSCs. It was found that series-internal resistance correlates positively with the sheet resistance of the transparent conducting oxide and the thickness of the electrolyte layer and negatively with the roughness factor of the platinum counter electrode. A cell sensitized with a black dye with series-internal resistance of 1.8 Ω cm2 was fabricated and showed conversion efficiency of 10.2% when measured with a metal mask under an air mass of 1.5 sunlight. © 2005 American Institute of Physics.
    May 2005, Applied Physics Letters, 86(21) (21), 1 - 3
    Scientific journal

  • Ashraful Islam, Firoz A. Chowdhury, Yasuo Chiba, Ryoichi Komiya, Nobuhiro Fuke, Noriaki Ikeda, Liyuan Han
    We have developed a new β-diketonato Ru(II) complex, Ru(4,4′,4″-tricarboxy-2,2′:6′,2″-terpyridine) [4,4,4-trifluoro-1-(4-fluorophenyl)butane-1,3-dionato](NCS)[(C H ) N] (1) which shows very efficient panchromatic sensitization of nanocrystalline TiO solar cell over the whole visible range extending into the near IR region (ca. 950 nm). A solar energy conversion efficiency of 8.9% was attained under standard AM 1.5 irradiation (100 mW cm ) with a short-circuit photocurrent density of 20.4 mA cm , an open-circuit photovoltage of 0.65 V, and a fill factor of 0.67. Copyright © 2005 The Chemical Society of Japan. 4 9 4 2 2 -2 -2
    Mar. 2005, Chemistry Letters, 34(3) (3), 344 - 345
    Scientific journal

  • Improvement of efficiency of dye-sensitized solar cells by reduction of internal resistance
    Naoki Koide, Yasuo Chiba, Ashraful Islam, Ryoichi Komiya, Nobuhiro Fuke, Atsushi Fukui, Ryohsuke Yamanaka, Liyuan Han
    In order to elevate conversion efficiency, the series-internal resistance of dye-sensitized solar cells (DSCs) was investigated with electrochemical impedance spectroscopy measurement based on an equivalent circuit of DSCs. It was found that series-internal resistance correlates negatively with the roughness factor of the platinum counter electrode and positively with the thickness of the electrolyte layer. A cell sensitized with a black dye with series-internal resistance of 1.8 Ωcm2 was fabricated and showed conversion efficiency of 10.2%, which was confirmed at the National Institute of Advanced Industrial Scienceand Technology (AIST, Japan). © 2005 IEEE.
    2005, Conference Record of the IEEE Photovoltaic Specialists Conference, 175 - 176
    International conference proceedings

■ MISC
  • ビオンテック 〜異⾊の起業家が成功に導いた⼤学発ディープテック型スタートアップ〜
    福家信洋, 青井貴之, 忽那憲治
    Lead, Nov. 2024, 東京⼤学応⽤資本市場研究センター ディスカッションペーパー
    Report research institution

  • TCOレス色素増感太陽電池の解析
    千葉恭男, 福井篤, 古宮良一, 福家信洋, 山中良亮
    2012, 応用物理学会学術講演会講演予稿集(CD-ROM), 73rd

  • 酸化チタンナノ微粒子膜に吸着したブラック色素からの遅い電子注入ダイナミクス
    加藤隆二, 古部昭広, 福家信洋, 小出直城
    2010, 配位化合物の光化学討論会講演要旨集, 22nd

  • 酸化チタンナノ微粒子膜に吸着した色素からの遅い電子注入ダイナミクスと効率
    加藤隆二, 古部昭広, 福家信洋, 小出直城
    2010, 分子科学討論会講演プログラム&要旨(Web), 4th

  • 色素増感電極における電子注入過程のTBP添加効果
    加藤隆二, 古部昭広, 福家信洋, 小出直城
    2009, 応用物理学関係連合講演会講演予稿集, 56th(3) (3)

  • 酸化チタンナノ結晶膜に吸着したブラック色素からの光誘起電子注入反応に及ぼす添加物効果
    加藤隆二, 古部昭広, 福家信洋, 小出直城, HAN Liyuan
    2009, 光化学討論会講演要旨集, 2009

  • 色素増感太陽電池モジュールの高効率化
    福井篤, 福家信洋, 小出直城, 山中良亮, 片山博之
    2008, シャープ技報, (98) (98)

  • ブラック色素から酸化チタンへの電子注入ダイナミクス
    加藤隆二, 古部昭広, 粕谷素洋, 福家信洋, 小出直城, HAN Liyuan
    2007, 電気化学会大会講演要旨集, 74th

  • 吸着N3色素からTiO2ナノ微粒子膜への光誘起電子注入効率に与えるTBPの影響
    粕谷素洋, 加藤隆二, 古部昭広, 福家信洋, 小出直城, 韓礼元
    2007, 固体・表面光化学討論会講演要旨集, 26th

  • High efficiency of dye-sensitized solar cell and module
    Liyuan Han, Atsushi Fukui, Nobuhiro Fuke, Naoki Koide, Ryohsuke Yamanaka
    IEEE, 2006, CONFERENCE RECORD OF THE 2006 IEEE 4TH WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION, VOLS 1 AND 2, 179 - 182, English

  • Improvement of Efficiency of Dye-Sensitized Solar Cells by Analysis of Internal Resistance
    HAN Liyuan, 小出直城, 千葉恭男, ISLAM Ashraful, 古宮良一, 福家信洋, 福井篤, 山中良亮
    2005, 日本化学会講演予稿集, 85th(1) (1)

  • 薄膜多結晶Siの形成と評価
    川島隆, 福家信洋, 古田寛, 吉田哲久, 播磨弘, 平尾孝
    2001, 応用物理学会学術講演会講演予稿集, 62nd(2) (2)

  • ELAポリシリコンの多結晶評価
    古田寛, 福家信洋, 識名紀之, 古田守, 鈴木達也, 吉田哲久, 播磨弘, 萩行正憲, 平尾孝
    2000, 応用物理学会学術講演会講演予稿集, 61st(2) (2)

■ Lectures, oral presentations, etc.
  • 固定価格買取制度における太陽光発電の卸電力市場への影響と経済的便益の評価
    福家信洋, 大橋和彦
    2024年度 日本太陽エネルギー学会 研究発表会, Nov. 2024, Japanese
    Oral presentation

  • Assessing the economic impact of photovoltaic generation on electricity prices and consumer economic benefits in Japan : An empirical study
    Nobuhiro Fuke, Kazuhiko Ohashi
    日本ファイナンス学会 第32回大会プログラム, Jun. 2024, Japanese
    Oral presentation

  • Seasonality in the impact of solar power generation on the electricity price level and variability
    Kazuhiko Ohashi, Nobuhiro Fuke
    Asian finance association annual meeting, Jun. 2023

  • Seasonality in the impact of solar power generation on the electricity price level and volatility
    Kazuhiko Ohashi, Nobuhiro Fuke
    2022 Econometric Society Asian Meeting, Aug. 2022

  • Seasonality in the impact of solar power generation on the electricity price level and volatility
    大橋和彦, 福家信洋
    日本ファイナンス学会第29回大会, Jun. 2021, Japanese
    Oral presentation

  • 太陽光発電導入が卸電力価格に与えた影響の分位点回帰分析- 九州における太陽光発電の電力価格への影響 –
    大橋和彦, 福家信洋
    日本経済学会2021年度春季大会, May 2021, Japanese
    Oral presentation

  • n-Butylamine capped CdSe Quantum Dot Sensitized Solar Cell.
    Nobuhiro Fuke, Laura B. Hoch, Alexey Y Koposov, Virginia W. Manner, Milan Sykora
    ACS Fall meeting, English
    [Invited]
    Invited oral presentation

  • 酸化チタンナノ結晶膜に吸着したブラック色素からの光誘起電子注入反応に及ぼす添加物効果
    加藤隆二, 古部昭広, 福家信洋, 小出直城, HAN Liyuan
    光化学討論会講演要旨集, 2009

  • 色素増感電極における電子注入過程のTBP添加効果
    加藤隆二, 古部昭広, 福家信洋, 小出直城
    応用物理学関係連合講演会講演予稿集, 2009

  • Back contact dye-sensitized solar cells
    N. Fuke, A. Fukui, Y. Chiba, R. Komiya, R. Yamanaka, L. Han
    The 17th International Photovoltaic Science and Engineering Conference, Dec. 2007, English
    Oral presentation

  • 吸着N3色素からTiO2ナノ微粒子膜への光誘起電子注入効率に与えるTBPの影響
    粕谷素洋, 加藤隆二, 古部昭広, 福家信洋, 小出直城, 韓礼元
    固体・表面光化学討論会講演要旨集, 2007

  • ブラック色素から酸化チタンへの電子注入ダイナミクス
    加藤隆二, 古部昭広, 粕谷素洋, 福家信洋, 小出直城, HAN Liyuan
    電気化学会大会講演要旨集, 2007

  • イオン注入した薄膜多結晶シリコンの結晶性回復に及ぼす水素の効果
    福家信洋, 播磨弘, 古田寛, 吉田哲久, 古田守, 鈴木達也, 平尾孝
    応用物理学会学術講演会講演予稿集, 2000

■ Affiliated Academic Society
  • 日本ベンチャー学会
    Apr. 2021 - Present

  • 日本ファイナンス学会
    Apr. 2021 - Present

■ Research Themes
  • 太陽光発電の電力価格とその変動性に与える影響
    福家 信洋
    日本学術振興会, 科学研究費助成事業, 基盤研究(C), 神戸大学, 01 Apr. 2024 - 31 Mar. 2027

TOP